As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAULT LIGHT AND APU DET INOP LIGHT ILLUMINATED ENGINE AND APU FIRE DETECTION SYSTEM WILL NOT TEST. WHEEL WELL FIRE DETECTION SYSTEM TEST OK. T/S PER FIM TASK 26-10-00-810-801 FOUND ALL LIGHTS ILLUMINATED ON FRONT OF ENG/ APU FIRE DETECTION CONTROL MODULE M 279. REMOVED AND REPLACED MODULE REF AMM 26-10-01-400-801, OPS CHECK NORMAL. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1470582 SN OFF 03249 PANEL, CONTROL, OFF 29-2615-9-0001 3249 ON 29-2615-9-0001 0470.